While I have this problem too - funny how the book never mentions Gandalf and Boromir's shared interest in Fireworks or Eomer's specialist knowledge of Wargs - I have taken it to a further stage alas - I have started to catch glimpses of Barrowdowners who don't have character names on the edge of the action. I haven't pinned down everyone yet, but surely that smoke wreathed couple in the corner of the Green Dragon are Lalwende and Davem, the dunadan who holds Halbarad's horse as he gives Arwen's standard to Aragorn well I suspect that is Fordim. Encaitare is an elf musician in the Hall of Fire and there are various others slowly coming into focus .... ir is a sickness. I admit it - but do I suffer alone?
PS I suspect I am one of Ioreth's sisters ..